Power Skates:
Complete all challenges (normal and hidden) hidden on every the level. The Power Skates give you one blue stat point for every attribute.

Ultra Skates:
Complete all the levels with 100%. The Ultra Skates give you the other blue stat point for every attribute.

Hint: Boardwalk: Hidden grind:
When on the roller coaster track, press Up(3), Grind to do a "double grind". You need to be near the tracks, since you are grinding both tracks at the same time.

Hint: Boardwalk: Easy points:
After you have unlocked the secret area, you can go to a tall spiral lighthouse. Go inside this lighthouse. The bottom is hollowed out. Get some speed up from the halfpipes outside the entrance then go into the lighthouse and hit one of the walls at an angle. Start wallriding up the middle, continually jumping and wall riding again around the inside walls. When you get about half-way up the inside, slow down your jumping so that instead of climbing up you are just wall riding around in an endless loop. You can get your multiplier up to 199X and do a trick worth 30 million points. This is also good for getting up your Wallri, Fakie, and Speed stats.

Go to the roller coaster and jump on the track. Grind either the two middle rails or the rail on the far right. Jump up and down continuously until you decide to jump off. This allows you to complete some objectives on that level and also get a massive amount of points in case you run out of juice.

Hint: Museum: Ark Of The Covenant:
The Ark of the Covenant can be found in the back area. Go up top the set of three quarter pipes hanging from the ceiling. Handplant the Ark to get a better view.

Hint: Museum: Hidden grind:
When on the display cases that are somewhat pyramidal, press Up(3), Grind to do a "double grind".

Hint: Extra points:
To do a near-infinite handstand combo, go up to a quarter or halfpipe in any level. Do a normal handstand, rocket, abstract, etc. Hold Down to make the meter go down, causing your handplant to end, but the trick is to keep pressing Grind repeatedly. As you get better, you can do up to a 50 trick combo. Note: This does not always work.

Go up any quarterpipe and do any desired tricks. Do the Cess Slide after your wheels hit the ground and try not to combo it with your tricks.

Find a half-pipe or a bowl and do some tricks. Before you land, do a Cess Slide into a Manual. The trick keeps going, and if you have enough skills, you can do it as long as desired.